Have 3 pool stores in striking distance (I'm in Jersey, we do chemicals). One, I have not dealt with in any way for 10 years. Not a chem issue, a costly construction/repair issue gone bad. Of the other 2, one is criminal. I have written this in another post, but I actually had a guy swearing up and down that I really didn't know what I was talking about and Trichlor did NOT have CYA in it. "It is nothing more than slow dissolving chlorine." Said it 10 times. Sad thing is, he won. I gave in. That was well before PF but after a lot of other reading. Just killed my confidence. The third? A local Leslie. They drop test. They are generally accurate and honest. I have, many times, had them say, "everything is good, great, enjoy!" Had weird issues with them 2 times but odd, not an attempt to sell me things I don't need. Anyway, everything in perspective right. Thanks PF. Again, like I said in other posts, still need them for parts.